Geology: English Vocabulary List

the scientific study of the Earth's lithosphere and the processes that shape its structure, including the movement of tectonic plates, earthquakes, and volcanic activity

"Plate tectonics explains how the continents slowly move over millions of years."

"The study of plate tectonics helps us understand the formation of mountain ranges and the occurrence of earthquakes."

(in geology) a narrow break or crack that partially divides a rock or surface without completely separating it

"The earthquake opened a deep fissure."

"A long fissure appeared in the ground after the earthquake shook the region."

a geological process where one tectonic plate moves under another and sinks into the Earth's mantle

"Subduction happens when one tectonic plate slides under another into the mantle."

"Subduction is the geological process where a dense oceanic plate sinks beneath a less dense continental plate"

the gravitational balance between Earth's rigid lithosphere and the underlying, semi-fluid asthenosphere, influencing variations in surface elevation

"Isostasy explains how continents float."

"Isostasy is the gravitational equilibrium between the Earth's crust and the mantle"

the Earth's rigid outer layer, made up of the crust and upper mantle, and divided into tectonic plates

"The lithosphere is the earth's outer layer."

"The lithosphere is the Earth's rigid outer layer, made up of the crust and upper mantle, divided into plates."

a layer of semi-fluid rock beneath the Earth's crust that allows tectonic plates to move

"The asthenosphere is partially molten rock."

"The asthenosphere is a layer of semi-fluid rock beneath the Earth's crust that allows tectonic plates to move."

a landscape formed from the dissolution of soluble rocks, characterized by sinkholes, caves, and underground drainage systems

"Karst landscapes have many caves."

"Karst is a distinctive topography formed by the dissolution of soluble rocks like limestone"

the geological process of mountain building, usually occurring due to the collision or convergence of tectonic plates

"Orogeny creates mountain ranges over millions of years."

"Orogeny is the geological process of mountain formation through tectonic plate collisions and volcanic activity."

a hollow rock with a cavity inside, lined with crystals or mineral material, formed through natural processes and often valued for its aesthetic qualities

"The geode contained beautiful crystals."

"When she cracked open the geode, she discovered stunning purple crystals inside."

a volcanic rock that often contains diamonds, formed during explosive eruptions from the Earth's mantle, and is of particular interest in diamond exploration and mining

"Kimberlite is a dark rock that sometimes contains diamonds deep inside it."

"Kimberlite is an igneous rock that forms deep in the Earth's mantle and is the primary source of mined diamonds"

the geological process involving the expansion and movement of glaciers, shaping landscapes through erosion, deposition, and the formation of distinctive glacial landforms

"Glaciation shaped many mountain valleys."

"Glaciation is a period of long-term cooling during which continental ice sheets and alpine glaciers advance"

a deposit of rocks, sediment, and glacial material left by a moving glacier, forming distinctive landforms along its edges or terminus

"The moraine was left by a glacier."

"A moraine is an accumulation of unsorted glacial debris pushed forward or deposited along the sides of a glacier as it advances and later retreats."

a streamlined, elongated hill formed by glacial action, with a teardrop shape and the steeper end facing the direction of ice movement

"Drumlins are hills made by glaciers."

"The geologist explained that a drumlin is a long, teardrop-shaped hill created by the slow movement of ancient glaciers."

a large, basin-shaped volcanic crater formed by the collapse of a volcano after a massive eruption

"The caldera is a volcanic crater."

"The massive eruption emptied the magma chamber, causing the caldera to form."

the physical and chemical changes occurring in sediments between their deposition and their consolidation into sedimentary rock

"Diagenesis turns sediment into rock."

"Diagenesis is the physical and chemical process that transforms deposited sediments into solid sedimentary rock through compaction and cementation under moderate pressure and temperature."

a complete change in the form and structure of a rock as a result of heat and pressure

"Heat causes metamorphism of rocks."

"Metamorphism transforms existing rocks into new forms under intense heat and pressure underground."

the process by which particles settle out of a liquid or gas due to gravity, forming a sediment layer

"Sedimentation occurs naturally."

"Sedimentation occurs when particles settle at the bottom of a river or lake over time."

the movement or displacement along a fracture in the Earth's crust, resulting from tectonic forces, which can lead to earthquakes

"Faulting created mountains."

"Faulting in the Earth's crust creates cracks where earthquakes are more likely to happen."

a layer of rock or sediment that stores and transmits groundwater

"The aquifer supplies water."

"The underground aquifer provides clean drinking water for the entire city through dozens of wells."

a hard lump or mass formed in sedimentary rock by natural cementing processes

"Rock concretion forms around a central core."

"The strange round rocks called concretions were formed by minerals cementing sand together over millions of years."

a large body of igneous rock formed beneath the Earth's surface from magma that has cooled and solidified

"This is a pluton."

"A pluton is a large body of igneous rock that formed deep underground and was later exposed by erosion."

a fast-moving mixture of volcanic ash, debris, and water

"A deadly lahar."

"The volcanic lahar destroyed villages on the mountain slopes."

the process during which a building or piece of land sinks to a lower level or to the ground

"Heavy mining caused dangerous land subsidence nearby"

"The mining town experienced gradual subsidence as the ground slowly sank into the abandoned tunnels beneath it."

(of rock) formed from cooled magma or lava

"The rock is igneous."

"Igneous rocks form when molten magma or lava cools and solidifies and granite and basalt are two common examples of this type of rock."

a large, rigid section of the Earth's lithosphere that moves, leading to geological activity like earthquakes and volcanic eruptions

"The earth's plates move slowly."

"Scientists study how tectonic plates interact at their boundaries to predict earthquakes."

(in geology) the bending or deformation of rock layers due to compressional forces

"The rock is folding."

"Geological folding occurs when tectonic forces compress rock layers, causing them to bend."

(geology) the injection of magma into existing rock formations underground

"Magma caused intrusion."

"Geologists studied the geological intrusion where molten rock forced its way into pre-existing layers of sedimentary rock."

(geology) the fine-grained material surrounding larger rock fragments or grains within a sedimentary rock

"The matrix is fine."

"The fine-grained matrix of the conglomerate rock holds together the larger pebbles and cobbles."